He was praying a naafil prayer, then some other people prayed behind him, so he changed his intention to make it an obligatory prayer

What is meant by the hadeeth, “Whoever visits a people should not lead them in prayer”

Should he pray behind someone whose ‘aqeedah is not known, whether there are Sufis and Shi’as in the country?

Can Women Lead Men in Prayer?

The imam’s pronunciation is defective, and some of the members of the congregation are hiding the fact that they have more knowledge of Quran

Ruling on prayers being led by one whose pronunciation is defective

Is Qunut Compulsory in Fajr?

An imam leads the Muslims in prayer and they dislike him, and he knows that

Praying behind ibaadis and innovators

If the imam did not intend to lead the prayer, then people come and he leads them